L'Hormona adrenocorticòtropa plasmàtica en el període postoperatori immediat com a índex predictor de la curació de la malaltia de Cushing

Authors

  • Carles Villabona

Abstract

A plasma cortisol less than 50 nmol/l in the early postoperative stage after transsphenoidal surgery for Cushings disease has been proposed as predictive of cure. Data on postoperative plasma adrenocorticotropin (ACTH) are scarce. The purpose of this study was to establish whether plasma ACTH in the early postoperative period after transsphenoidal surgery for Cushings disease can predict cure and to compare its prognostic value with that of plasma cortisol. We analysed thirteen patients with Cushings disease (mean age forty-three years) treated with transsphenoidal surgery. Plasma cortisol andACTHsamples were taken in the first seven days after surgery. Follow-up was between twelve and fifty-five months (mean thirtyfour months). During this time samples for basal plasma cortisol and after stimulation with 250 µg of ACTH1-24, basal plasma ACTH, 24 hours free urinary cortisol and low-dose suppression with dexametasone (0,5 mg/6 h for two days) were taken periodically to evaluate their clinical status. Twelve patients (92,3 %) were in remission during follow-up. The early postoperative cortisol level was 50 nmol/l or less in only four of the twelve patients in remission, while the ACTH level was 2 pmol/l or less in six of these patients. Normal values for ACTH are between 2 and 12 pmol/l. The value of plasma ACTH levels measured in the first postoperative week is not a better predictor of cure than early postoperative plasma cortisol level. A very low plasma ACTH level can not predict cure.

Published

2007-12-28